Air cleaning units; Air cleaning units containing an air filter, ultraviolet lights and a photocatalytic filter; Air exchangers for cleaning and purifying air; Air filtering installations; Air purification units; Air purifiers; Air purifying apparatus; Air purifying apparatus and machines; Air purifying units for green house, hospital, agricultural and industrial use; Air sterilisers; Air sterilizers; Air sterilizers for green house, hospital, agricultural and industrial use; Ionisation apparatus for the treatment of air; Ionization apparatus for the treatment of liquids and gases for industrial, commercial or agricultural use; Ozone generators that kill mold and mildew; Catalytic oxidizers for industrial air pollution control; Catalytic oxidizers for industrial air pollution control of volatile organic compounds, airborne germs, bacteria and viruses; Combination ozone sanitizer and electric deodorizing units; Electric air deodorizers; Electric air deodorizing apparatus; Emission control systems comprised primarily of indirect contact heat exchangers and ozone-based control devices using gas and vapor condensing to control and treat emissions; Germicidal lamps for purifying air; Industrial air purifiers; Ionization apparatus for the treatment of air; Locally induced air-conditioners; Ozone sanitizers for air and water; Separators for the cleaning and purification of air